AD5251 Analog Devices, AD5251 Datasheet - Page 7

• Manufacturer Part Number: AD5251
• Description: (AD5251 / AD5252) Dual 64-and 256-Position I2C Nonvolatile Memory Digital Potentiometers
• Manufacturer: Analog Devices

INTERFACE TIMING CHARACTERISTICS
Guaranteed by design, not subject to production test. See Figure 3 for location of measured values. All input control voltages are
specified with tR = tF = 2.5 ns (10% to 90% of 3 V), and timed from a voltage level of 1.5 V. Switching characteristics are measured
using both V
Table 3. Interface Timing and EEMEM Reliability Characteristics (All Parts).
Parameter
INTERFACE TIMING
FLASH/EE MEMORY RELIABILITY
1
2
3
During power-up, all outputs preset to midscale before restoring to the final EEMEM contents. RDAC0 has the shortest, whereas RDAC3 has the longest EEMEM data
restoring time.
Retention lifetime equivalent at junction temperature T
with junction temperature.
When the part is not in operation, the SDA and SCL pins should be pulled to high. When these pins are pulled to low, the I
about 0.8 mA at V
SCL Clock Frequency
tBUF Bus Free Time between STOP and
t
t
t
t
t
t
t
t
t
EEMEM Data Storing Time
EEMEM Data Restoring Time at
EEMEM Data Restoring Time Upon
EEMEM Rewritable Time (delay time after
Power On or RESET before EEMEM can
Endurance
Data Retention
START
Power-On
Restore Command or RESET Operation
be written)
HD;STA
LOW
HIGH
SU;STA
HD;DAT
SU;DAT
F
R
SU;STO
Fall Time of Both SDA and SCL Signals
Rise Time of Both SDA and SCL Signals
Low Period of SCL Clock
High Period of SCL Clock
Setup Time For START Condition
Hold Time (Repeated START)
Data Setup Time
Setup Time for STOP Condition
Data Hold Time
1
2
DD
DD
= 3 V and 5 V.
3
= 5.5 V and 0.2 mA at V
DD
= 2.7 V.
1
Symbol
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
SCL
J
1
2
3
4
5
6
7
8
9
10
EEMEM_STORE
EEMEM_RESTORE1
EEMEM_RESTORE2
EEMEM_REWRITE
= 55°C per JEDEC Std. 22, Method A117. Retention lifetime based on an activation energy of 0.6 eV derates
Rev. 0 | Page 7 of 28
Conditions
After this period, the first clock pulse
is generated
V
without decoupling capacitors at V
and V
V
DD
DD
rise time dependent. Measure
= 5 V
SS
.
DD
2
C interface at these pins conducts current of
Min
1.3
0.6
1.3
0.6
0.6
0
100
0.6
100
Typ
26
300
300
540
100
AD5251/AD5252
Max
400
0.9
300
300
Unit
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
ms
µs
µs
µs
kCycles
Years